Ko Samui or Koh Samui, often locally shortened to Samui, is an island off the east coast of Thailand. Geographically in the Chumphon Archipelago, it is part of Surat Thani Province, though as of 2012, Ko Samui was granted municipal status and thus is now locally self-governing. Ko Samui, with an area of 228.7 square kilometres (88.3 sq mi), is Thailand's second largest island after Phuket. In 2018, it was visited by 2.7 million tourists.

Contender: Koh Samui
Contender: Koh Samui
Contender: Ko Samui, Thailand
Ranked #3 on "Best Thai Islands 2026: Top 10 Ranked for Beauty, Vibe & Adventures". Cast your vote to back or challenge this spot.
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“Top 10 Southeast Asian Beach Destinations”
Ranks as high as #3 on some lists — but only #7 here. Fans are divided.
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